基于全天空流星雷达测量动量通量的新方法

A new method of determining momentum flux based on the all-sky meteor radar

全天空流星雷达是新一代的流星雷达,可以接收流星余迹反射的无线电波,目前主要应用于探测流星烧蚀区域的大气风场进而研究该区域的大气动力学。文章利用全天空流星雷达,基于Hocking提出的测量重力波动量通量的新方法来研究昆明地区的大气环境参数——重力波的动量通量。由于采样间隔的不同,该方法仍存在争议。文中主要利用昆明站工作频率为37.5 MHz的全天空流星雷达测得的流星数据来验证采样时间对重力波动量通量取值的影响,同时利用工作频率分别为37.5 MHz、53.1 MHz的全天空流星雷达在2014年9月份观测的数据对该方法进行了对比分析,结果表明:采样时间间隔的选取对重力波动量通量的取值有很大影响;在合适的采样时间间隔内利用全天空流星雷达测量重力波的动量通量的新方法是可行的。

The all-sky meteor radar recently developed was the newest generation of meteor radars, which can receive the radio waves reflected by meteor echoes. At present the main objects observed by the modern meteor radar is the atmospheric wind fields in the meteor region, with the purpose of research atmospheric dynamics. This thesis utilized all-sky meteor radar based on a new method which is used for determining momentum flux by Hocking to research atmospheric circumstance parameters-momentum fluxes of gravity waves. Because of the difference of sampling time, this new method is still controversial. We mainly used the data collected by the all-sky meteor radar operated at 37.5 MHz to validate the influence of sampling time of gravity momentum fluxes. At the same time, using data collected by the all-sky meteor radar with different frequencies(37.5 MHz、53.1MHz) during September 2014, verification was made on whether the new method improved by Hocking is right or not. The results show that: the choice of sampling time influences the determination of gravity waves a lot; and with suit sampling interval,it is viable to determine gravity wave momentum fluxes using the new method based on all-sky meteor radar.